In a message to fellow artists, Lily Allen said file-sharing was "having a damaging effect on British music".

She said it "eats away at opportunity for new artists" because there is less money for record labels to spend on signing and developing new artists.

"The majority of British artists are against file-sharing, because it will harm British music," she wrote.

"We can talk about all the legal means of accessing music out there and even come up with new ways to access music, but ultimately we need to establish that we think file-sharing is wrong."

Take That star Gary Barlow wrote in response: "I agree with every single sentence. I spend so much of my spare time helping up-and-coming artists find their way, so am fully aware of all the issues in your letter."

The most vital step at this moment is to ensure that 'the artists' present a united front

Tim Rice-Oxley (right)Keane

In a video message, R&B star Taio Cruz, who is currently number one in the UK singles chart, said his debut album was almost scrapped because it was leaked three months before its release.

The leak was "substantially damaging" to eventual album sales, he said. "Both my label and myself were left in a very difficult position.

"I could have been dropped from my record deal because so much was spent and so much of my album was leaked and not paid for. But luckily my label had great belief in me. File-sharing has had a very, very negative effect on my career, as it has on many others."

He added: "I think it's very positive to see that other artists, along with the government, are coming together to defend the right to protect our art."

Spandau Ballet's Gary Kemp told Allen: "You have my support. Well done for making the effort and not just sitting on the fence like most people."

Keane songwriter Tim Rice-Oxley said: "I'll happily state that I support you in this movement and agree that we have to act now.

"I also feel strongly that the most vital step at this moment is to ensure that 'the artists', whether FAC-related or not, present a united front and a simple message."

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